simplify

packages/svelte/src/internal/client/dom/blocks/css-props.js

@@ -2,7 +2,7 @@ import { namespace_svg } from '../../../../constants.js';
 import { current_hydration_fragment, hydrate_block_anchor, hydrating } from '../hydration.js';
 import { empty } from '../operations.js';
 import { render_effect } from '../../reactivity/effects.js';
-import { insert, remove } from '../reconciler.js';
+import { remove } from '../reconciler.js';
 
 /**
  * @param {Element | Text | Comment} anchor
@@ -33,7 +33,7 @@ export function css_props(anchor, is_html, props, component) {
 			tag = document.createElementNS(namespace_svg, 'g');
 		}
 
-		insert(tag, null, anchor);
+		anchor.before(tag);
 		component_anchor = empty();
 		tag.appendChild(component_anchor);
 	}

packages/svelte/src/internal/client/dom/blocks/svelte-element.js

@@ -7,10 +7,10 @@ import {
 	render_effect,
 	resume_effect
 } from '../../reactivity/effects.js';
-import { insert, remove } from '../reconciler.js';
-import { current_block, execute_effect } from '../../runtime.js';
+import { remove } from '../reconciler.js';
+import { current_block } from '../../runtime.js';
 import { is_array } from '../../utils.js';
-import { run_transitions, set_run_transitions } from '../../render.js';
+import { set_run_transitions } from '../../render.js';
 
 /**
  * @param {import('#client').Block} block
@@ -119,7 +119,8 @@ export function element(anchor_node, tag_fn, is_svg, render_fn) {
 						render_fn(element, anchor);
 					}
 
-					insert(element, null, anchor_node);
+					anchor_node.before(element);
+
 					if (prev_element) {
 						swap_block_dom(block.p, prev_element, element);
 						prev_element.remove();

packages/svelte/src/internal/client/dom/reconciler.js

@@ -47,7 +47,7 @@ export function insert(current, parent_element, sibling) {
 			}
 		}
 		return current[0];
-	} else if (current !== null) {
+	} else {
 		if (sibling === null) {
 			append_child(/** @type {Element} */ (parent_element), /** @type {Node} */ (current));
 		} else {